diff --git a/sound/soc/sof/ipc4-topology.c b/sound/soc/sof/ipc4-topology.c
index 7cb63e6b24dc..c9c1d2ec7af2 100644
--- a/sound/soc/sof/ipc4-topology.c
+++ b/sound/soc/sof/ipc4-topology.c
@@ -895,7 +895,8 @@ static int sof_ipc4_widget_setup_comp_process(struct snd_sof_widget *swidget)
 	if (process->init_config == SOF_IPC4_MODULE_INIT_CONFIG_TYPE_BASE_CFG_WITH_EXT) {
 		struct sof_ipc4_base_module_cfg_ext *base_cfg_ext;
 		u32 ext_size = struct_size(base_cfg_ext, pin_formats,
-						swidget->num_input_pins + swidget->num_output_pins);
+					   size_add(swidget->num_input_pins,
+						    swidget->num_output_pins));
 
 		base_cfg_ext = kzalloc(ext_size, GFP_KERNEL);
 		if (!base_cfg_ext) {